Chemistry Answers

The decomposition of N2O5 is an important process in tropospheric chemistry. The half-life

for the first order decomposition of this compound is 2.05X104 s. How long will it take for a

sample of N2O5 to decay to 60% of its initial value?

For the following reaction, 108 grams of silver nitrate are allowed to react with 23.6 grams of copper .

silver nitrate(aq) + copper(s)  copper(II) nitrate(aq) + silver(s)

What is the maximum amount of copper(II) nitrate that can be formed?  grams

What is the FORMULA for the limiting reagent?

What amount of the excess reagent remains after the reaction is complete?  grams

calculate the time required to deposit 56g of silver from a silver nitrate(AgNO3)solution using a current of 4.5amper

For the following reaction, 4.41 grams of hydrogen gas are allowed to react with 39.8 grams of iodine .

hydrogen(g) + iodine(s)  hydrogen iodide(g)

What is the maximum mass of hydrogen iodide that can be formed?  grams

What is the FORMULA for the limiting reagent?

What mass of the excess reagent remains after the reaction is complete?  grams

A mixture of Al and Fe weighing 0.2000 g is treated with excess HCI solutions. Each metal reacts separately with the acid, resulting in the production of hydrogen gas H2, and a chloride salt. After treatment, a total volume of 200mL of the evolved gas was collected at 20 °C and 850 torr. Calculate for the mass percentage of Al in the sample.

calculate the new freezing point of water when 72.0 g of BaCl2 are added to 0.175 kg of water

How many moles of ethanol is produced if you start with 8.74 g of glucose

The half life of iridium is 12.8 years. Calculate decay constant and average life in minutes

A 3.00 g sample of TNT (trinitrotoluene, C7H5N3O6) is placed 

in a bomb calorimeter with a heat capacity of 1.93 kJ/°C; the 

ΔHcomb of TNT is −3403.5 kJ/mol. If the initial temperature of 

the calorimeter is 19.8°C, what will be the final temperature of 

the calorimeter after the combustion reaction (assuming no heat 

is lost to the surroundings)

Calculate for the specific heat of 28.0 g of of mercury (Hg)

when 137 J of energy is involved when raised at an initial

temperature of 22.0°C to a final temperature of 57. 0C.